Question T4B05
From subelement T4 - T4B
What does the scanning function of an FM transceiver do?
Why is this correct?
The scanning function automatically tunes through a programmed range of frequencies or memory channels to detect activity. When it finds a signal above the squelch threshold, it pauses to let you listen. Once transmission ends, scanning resumes. This helps find active repeaters or monitor multiple channels efficiently. Options A (signal deviation checking) and D (digital bulletin boards) describe different functions entirely, while B (preventing interference) isn't what scanning does.
Memory tip
Remember that scanning is about listening, not transmitting or measuring. The key word 'tunes through' in option C signals this is about frequency searching. Most radio functions that end in '-ing' (scanning, monitoring) involve passive reception rather than active transmission or technical measurement.
Learn more
Scanning mirrors how you'd manually tune across frequencies looking for conversations, but automated. Modern transceivers can scan memory channels containing your favorite repeater frequencies, or sweep frequency ranges. This proves invaluable during emergencies when you need to quickly locate active communication channels, or when traveling to find local repeater activity. The scanning feature essentially acts as your electronic ears, continuously monitoring the airwaves.
Think about it
Why do you think the scanning function pauses when it detects activity rather than continuously sweeping through frequencies even during transmissions?